When connected to a PC via USB, the sound from the headphones sometimes becomes muddy. There is likely a malfunction in the USB section, but I don't know the details. Please purchase only if you are able to repair it yourself or use it for parts. We do not offer support. Please understand that we cannot answer questions (because we don't know). Please do not purchase if you are looking for a fully functional product. The manual has a section that may come loose. Cubase LE download version serial included. I haven't used it. May not work on the latest OS (unconfirmed) SD card not included. Items not shown in the photos are not included. - Model Name: R8 - Number of Inputs: 2 inputs - Connection Type: USB connection - Function: Multitrack recorder - Included Items: Instruction manual, USB cable Thank you for viewing.